Install Instructions

39 65-0100—2
12
Q7800
13
14
15
16
18
17
19
20
21
22
G
L2
9
8
7
6
5
4
3
10
F
G
L2
9
8&15
4
7
M2518B
A
5, 6
F1
GENERAL FOOTNOTES, SEE PAGE 5.
A
B
G
D
1234
5 7815
18
B
F
C
D
B
C
7800 SERIES CONVERSION WIRING DIAGRAM
FROM________________________________ TO ______________________
(DEVICE TO BE MODERNIZED) (O.S. NUMBER OF RELAY MODULE TO BE USED)
L1&3
R4127 (ALL MODELS)
RM7840E1016 OR RM7800E1010
RM7840L1018 OR RM7800L1012
C
E
F
G
D
IF LOW FIRE SWITCH IS NOT USED,
JUMPER Q7800 SUBBASE TERMINALS 5
AND 18. NOTE: THIS WILL ADD 30 SECONDS
TO THE PREPURGE TIMING.

R4127DEVICE MAY HAVE 15, 30, 55, OR 60
SECOND MFEP. REPLACEMENT DEVICE
PROVIDES 10 OR 15 SECONDS ONLY. 
INSURANCE CODES REQUIRE 10 SECOND
MFEP. FOR GAS, NO.2 OIL AND NO.4 OIL
APPLICATIONS.

R4127 PROVIDES 10 SECONDS IGNITION-
REPLACEMENT RM7840/RM7800 PROVIDE
5 SECONDS.

FOR RM7840L/RM7800L, JUMPER Q7800
SUBBASE TERMINAL 19 TO 5. NOTE: THIS
WILL EXTEND PREPURGE TIME 30 SECONDS.
FOR RM7840E/RM7800E,J JUMPER Q7800
SUBBASE TERMINAL 19 TO 4. NOTE: THIS
WILL EXTEND PREPURGE TIME 30 SECONDS. 

Q535 OR Q536 SUBBASE HAD U1 AND U2
TERMINALS THAT WERE USED FOR
C7020 AND C7012E,F FLAME DETECTORS.
A. TO MODERNIZE C7020 APPLICATIONS,
CHOOSE A NEW DECTOR AND
REWIRE PER RM7840/RM7800
SPECIFICATIONS.
B. TO MODERNIZE A C7012E,F
APPLICATION, USE THE EXISTING
SENSOR AND REWIRE PER 
RM7840/RM7800 SPECIFICATIONS.
LOCATE THIS JUNCTION 
AND CONNECT IT TO
Q7800 SUBBASE
TERMINAL 6

LOCATE THE START INTERLOCKS AT THIS POINT AND 
CONNECT IT TO Q7800 SUBBASE TERMINAL 20. 
START INTERLOCKS NOW BECOME PREIGNITION 
INTERLOCKS. IF START INTERLOCKS ARE NOT USED,
JUMPER Q7800 TERMINALS 4 TO 20.
LIMITS
CONTROLLER
START
INTERLOCKS
AIRFLOW
SWITCH
L1
3
4
16
12
13
14
11 IF USED
MAIN VALVE
10
IGNITION
TRANSFORMER
FOR DIRECT SPARK IGNITION 
(OIL OR GAS)
8
9
L2
15
For Insurance Requirements
5